Train Problem I

#include<bits/stdc++.h>

using namespace std;

int main(){
    int n;
    char c;
    while(~scanf("%d",&n)){
    	
        vector<char> one;
        vector<char> two;
        vector<char> three;
		  
	    ///存0,1   1代表进
 
        for(int i =0;i<n;i++){
            cin >> c;
            one.push_back(c);
        }
        for(int i =0;i<n;i++){
            cin >> c;
            two.push_back(c);
        }
        
        
        stack<char> st;
        int t = 0;
        int flag = 0;
        
        
        for(int i=0;i<n;i++){
		    ///判断间断入栈的过程
            while(st.empty() || st.top()!= two[i]){
                if(t<n){
                    three.push_back(1);
                    st.push(one[t++]);
                }
                else{
                flag = 1;
                break;
            }
            
            }
            if(st.top()==two[i]){
                three.push_back(0);
                st.pop();
            }
           

        }
        
        
        
        
        if(flag)
            cout << "No." << endl;
        else{
            cout << "Yes." <<endl;
            for(int i = 0;i<2*n;i++){
                if(three[i])
                    cout << "in" << endl;
                else
                    cout << "out" << endl;
            }
        }
        cout << "FINISH" <<endl;
    }
    return 0;
}